Multi-band built-in antenna

ABSTRACT

A multi-band built-in antenna for a portable wireless terminal is provided. In the multi-band built-in antenna, a first radiation part processes signals of a first frequency band. A second radiation part, spaced apart from the first radiation part and electrically connected to the first radiation part, processes signals of a second frequency band lower than the first frequency band. And, a sub-radiator is electrically connected to the second radiation part and the sub-radiator is movable.

PRIORITY

This application claims the benefit under 35 U.S.C. §119(a) of a Koreanpatent application filed in the Korean Intellectual Property Office onOct. 1, 2007 and assigned Serial No. 2007-98693, the entire disclosureof which is hereby incorporated by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to an antenna for a portable wirelessterminal. More particularly, the present invention relates to amulti-band built-in antenna for receiving and transmitting multi-bandsignals for a portable wireless terminal.

2. Description of the Related Art

Currently, portable wireless terminals such as Personal CommunicationSystems (PCS), Global Positioning Systems (GPS), a Personal DigitalAssistant (PDA), cellular phones and wireless notebook computers, arebeing widely used. Since their introduction, these terminals haveevolved into smaller and slimmer devices based on user demand. Also,these terminals are being provided with various functions in addition tothe voice communication function. Therefore, in order to continuesatisfying user desires and demands, the design of the terminal isfocused on a size reduction while maintaining or improving the functionsas well as providing new ones.

Portable wireless terminals include an antenna for radio communication.The antenna can be classified into an external type and a built-in type.An external type antenna is installed in a portable wireless terminal insuch a manner that it protrudes from the terminal body. Conversely, abuilt-in antenna is installed on a Printed Circuit Board (PCB,hereinafter also called a motherboard) located internally of a portablewireless terminal without any external protrusion. Further, an externalantenna can be classified into a dipole antenna having a feed part and aground part or a monopole antenna having only a feed part. The monopoleantenna has a feed part electrically connected to a feed pad of a PCB. Abuilt-in antenna can be classified in the same way. The built-in antennais more widely used than the external antenna because of its portabilityand the improvements it affords to the portable terminal's externalappearance.

Though the performance of the antenna is proportional to the size of theantenna, a large antenna makes the terminal bigger. Therefore, there isa need for an antenna that can improve radiation performance withoutincreasing its size and reduce a Specific Absorption Rate (SAR).

FIG. 1 is a perspective view of a conventional dual-band built-inantenna.

Referring to FIG. 1, the antenna 100 is mounted on a mother board (i.e.PCB, not shown) and is electrically connected with the PCB.

The antenna 100 includes a radiator 120 to radiate radio signals and acarrier 110 on which the radiator 120 is affixed. The carrier 110 ismanufactured by molding.

The radiator 120 includes a conductive plate 121 manufactured by sheetmetal processing. The plate 121 includes a feed part 124 and a groundpart 125, projected downwardly from a portion of the plate 121, couplingwith the PCB. Also, the carrier 110 includes a plurality of fixingprotrusions projected upwardly, and the plate 121 includes a pluralityof fixing holes 123, each corresponding to a fixing protrusion. Theplate 121 can be fixed to the carrier 110 by any suitable means, such ashot melt adhesion or ultrasonic welding.

The radiator 120 can be partitioned into a first radiation part 121A forprocessing signals of a high frequency band and a second radiation part121B for processing signals of a low frequency band. That is, the firstradiation part 121A and the second radiation part 121B process signalsof different frequency bands.

Also, the first radiation part 121A and the second radiation part 121Bhave different radiation patterns to process signals of differentfrequency bands. Each radiation pattern has a width and a length. Forexample, a radiation pattern of the first radiation part 121A can have agreater average width than that of the second radiation part 121B. Thefeed part 124 provides the plate 121 with a transmission signal from thePCB. When the signal to be transmitted is received from the PCB, thefirst radiation part 121A processes signals of a high frequency band andthe second radiation part 121B processes signals of a low frequencyband.

The dual-band built-in antenna 100 only processes signals ofdual-frequency bands. However, as communication technologies continue toadvance, portable wireless terminals are becoming more sophisticatedincluding the ability to operate in three or more frequency bands.Therefore, there is a need for an antenna that can accommodate andimprove the processing of signals for three or more frequency bandswithout increasing the size of the antenna or the size of the terminal.

SUMMARY OF THE INVENTION

An aspect of the present invention is to address at least theabove-mentioned problems and/or disadvantages and to provide at leastthe advantages described below. Accordingly, an object of the presentinvention is to provide a multi-band built-in antenna for a portablewireless terminal that can process multi-band signals without increasingthe size of the terminal.

Another object of the present invention is to provide a multi-bandbuilt-in antenna for a portable wireless terminal that can improveradiation performance while maintaining a slim and lightweight terminal.

A further object of the present invention is to provide a multi-bandbuilt-in antenna for a portable wireless terminal that can improveradiation performance of a high frequency band for a Digital CellularSystem (DSC) and a Personal Communication System (PCS).

According to an aspect of the present invention, a multi-band built-inantenna for a portable wireless terminal is provided. The antennaincludes a first radiation part for processing signals of a firstfrequency band, a second radiation part, spaced apart from the firstradiation part and electrically connected to the first radiation part,for processing signals of a second frequency band that are lower thanthe first frequency band and a sub-radiator that is electricallyconnected to the second radiation part and is movable.

According to another aspect of the present invention, a portablewireless terminal is provided. The terminal includes an RF board havinga feeding unit and grounding unit, a carrier fixed on the RF board, afirst radiation part for processing signals of a first frequency band,fixed to the top surface of the carrier, a second radiation part,horizontally spaced apart from the first radiation part and electricallyconnected to the first radiation part, fixed to the top surface of thecarrier, for processing signals of a second frequency band lower thanthe first frequency band, a feed part and a ground part, protruding fromone end of at least one of the first radiation part and the secondradiation part and electrically connected to the feeding unit and thegrounding unit, respectively and a sub-radiator that is electricallyconnected to the second radiation part and is movable.

Other aspects, advantages, and salient features of the invention willbecome apparent to those skilled in the art from the following detaileddescription, which, taken in conjunction with the annexed drawings,discloses exemplary embodiments of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other aspects, features, and advantages of certainexemplary embodiments of the present invention will be more apparentfrom the following description taken in conjunction with theaccompanying drawings, in which:

FIG. 1 is a perspective view of a conventional dual-band built-inantenna;

FIG. 2 is a perspective view of a portable wireless terminal using amulti-band built-in antenna according to an exemplary embodiment of thepresent invention;

FIG. 3A is an exploded perspective view of a multi-band built-in antennaaccording to an exemplary embodiment of the present invention;

FIG. 3B is a perspective view of a multi-band built-in antenna accordingto an exemplary embodiment of the present invention;

FIG. 4A is a partial cross-sectional view corresponding to line A-A′ ofFIG. 3B;

FIG. 4B is a partial cross-sectional view corresponding to line B-B′ ofFIG. 3B;

FIG. 5 is a partial view of a portable wireless terminal according to anexemplary embodiment of the present invention;

FIG. 6 is a graph showing a Voltage Standing Wave Ratio (VSWR) of theconventional dual-band built-in antenna illustrated in FIG. 1;

FIG. 7 is a graph showing VSWR and a partial plane view of a multi-bandbuilt-in antenna according to an exemplary embodiment of the presentinvention, when a sub-radiator is in a position to process signals of aDigital Cellular System (DCS) frequency; and

FIG. 8 is a graph showing VSWR and a partial plane view of a multi-bandbuilt-in antenna according to an exemplary embodiment of the presentinvention, when a sub-radiator has moved to process signals of aPersonal Communication Systems (PCS) frequency.

Throughout the drawings, it should be noted that like reference numbersare used to depict the same or similar elements, features andstructures.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

The following description with reference to the accompanying drawings isprovided to assist in a comprehensive understanding of exemplaryembodiments of the invention as defined by the claims and theirequivalents. It includes various specific details to assist in thatunderstanding but these are to be regarded as merely exemplary.Accordingly, those of ordinary skill in the art will recognize thatvarious changes and modifications of the embodiments described hereincan be made without departing from the scope and spirit of theinvention. Also, descriptions of well-known functions and constructionsare omitted for clarity and conciseness.

Though a slide type terminal is illustrated, this is merely for exampleand should not be considered as limiting. That is, the present inventioncan also be applied to other and various types of terminals, such as aflip type terminal, a folder type terminal, a bar type terminal and thelike.

FIG. 2 is a perspective view of a portable wireless terminal using amulti-band built-in antenna according to an exemplary embodiment of thepresent invention.

Referring FIG. 2, a portable wireless terminal 200 includes a main body210 and a sub-body 220 that slides on and relative to the main body 210.The main body 210 includes a keypad assembly 203 as a data input deviceand a microphone 204 located under the keypad assembly 203 for input ofvoice signals. Also, the sub-body 220 includes an earpiece 201 to outputvoice or other audible signals and a display 202 under the earpiece 201.In an exemplary implementation, the display 202 may be a Liquid CrystalDisplay (LCD) having up to millions of pixels. Also, if the LCD isprovided as a touch screen, the display 202 may perform a part or all ofthe functions of an input unit, either supplemental or in place ofkeypad assembly 203.

The portable wireless terminal 200 processes signals of multiplefrequency bands using a multi-band built-in antenna shown, for example,in FIG. 3A according to an exemplary embodiment of the presentinvention.

As will be explained in more detail below, the multi-band built-inantenna of the portable wireless terminal 200 may include asub-radiator. To process signals of the multiple frequency bands, thesub radiator may be movable.

For example, the sub-radiator may be moved to a first position forprocessing signals of a Global System for Mobile Telecommunication (GSM)and signals of a Digital Cellular System (DCS) and is movable to asecond position for processing signals of a GSM and a PersonalCommunication System (PCS).

FIGS. 3A and 3B are exploded perspective views of a multi-band built-inantenna 300 according to an exemplary embodiment of the presentinvention and FIGS. 4A and 4B are partial cross section viewsrespectively corresponding to lines A-A′ and B-B′ illustrated in FIG.3B.

Referring to FIGS. 3A to 4B, the multi-band built-in antenna 300includes a radiator 320 for transmitting and receiving radio frequencysignals, a carrier 310 on which the radiator 320 is affixed and asub-radiator 330 connected to the radiator 320. The sub-radiator 330 ismovable.

The radiator 320 includes a conductive plate 321 having a radiationpattern for processing radio frequency signals. In an exemplaryimplementation, the conductive plate 321 is made by press processing. Inaddition, the conductive plate 321 is for electrically connecting theantenna 300 to a circuit board (e.g. a mother board or a Printed CircuitBoard (PCB)) of a portable wireless terminal. The conductive plate 321includes a feed part 324 and a ground part 325. The feed part 324 andthe ground part 325 respectively protrude from one end of the radiator320. Based on the configuration of the radiator 320 being affixed to thecarrier 310, and the carrier 310 mounted on the PCB, the feed part 324and the ground part 325 may be electrically connected to the PCB.

The carrier 310 also includes a body 311. In an exemplaryimplementation, the body 311 is made by injection molding. The body 311of the carrier 310 includes one or more fixing protrusions 313projecting upwardly from the top of the body 311. The plate 321 includesa plurality of fixing holes 323 corresponding to the fixing protrusions313. Therefore, the radiator 320 can be fixed to the carrier 310 usingthe fixing holes 323 by any suitable fusion means, such as hot meltadhesion, ultrasonic welding and the like.

The plate 321 of the radiator 320 includes a guide slot 322. In anexemplary implementation, the guide slot 322 is formed as an elongatedhole which penetrates through the plate 321. In addition, thesub-radiator 330 includes a guide protrusion 333, projected downwardlyfrom a lower or bottom side of the sub-radiator 330. Furthermore, thebody 311 of the carrier 310 includes a first sub-slot 312 correspondingto the guide protrusion 333. As best illustrated in FIGS. 3B, 4A and 4B,when the multi-band built-in antenna is assembled, the guide protrusion333 simultaneously passes through both the guide slot 322 and throughthe first sub-slot 312 which are aligned with each other. Therefore, theguide protrusion 333 may be moved along a path of the guide slot 322.Also, the sub-radiator 330 is electrically connected to the radiator 320and maintains the electrical connection while moving from one positionto another.

In addition, a guide block 334 is provided to secure the configurationof the movable sub-radiator 330. More specifically, the guide block 334is fixed to a lower side of the guide protrusion 333 by a fixing means,such as a screw 336. The guide block 334 has a larger width than theguide protrusion 333. Also, as best illustrated in FIG. 4B, the body 311of the carrier 310 includes a second sub-slot 312′. The second sub-slot312′ has a greater width than the first sub-slot 312 and is locatedunder the first sub-slot 312. Accordingly, the guide block 334, fixed byfixing means 336 to the guide protrusion 333 and having a widthcorrelating to the width of the second sub-slot 312′, is moved along apath of the second sub-slot 312′ while the guide protrusion 333 movesalong a path of the guide slot 322. Furthermore, the guide block 334,having a width greater than the width of the guide protrusion 333 andgreater than the width of the first sub-slot 312, prevents the guideprotrusion 333 from escaping the guide slot 322. Thus, the guide block334 secures the sub-radiator 330 as it moves in a sliding manner.

Therefore, the sub-radiator 330 is not separated upwardly from theradiator 320 because of the guide block 334 as an obstacle. Also, thesub-radiator 330 is not separated downwardly from the radiator 320because of the plate 321 as an obstacle. Once the sub-radiator 330 isconnected to the radiator 320 by the guide block 334, the sub-radiator330 can be moved horizontally while being secured from escaping in anupward or downward direction.

The sub-radiator 330 includes a conductive sub-plate 331 having aradiation pattern, for example a right angle pattern, ‘

’. The sub-radiator 330 includes a handling protrusion 332 which allowsfor control of its movement by a user. In an exemplary implementation,the handling protrusion 332 is projected upwardly from top of the plate331. In a further exemplary implementation, the handling protrusion 332,the guide protrusion 333 and the guide block 334 are all located on aperpendicular extension of the sub-plate 331.

The handling protrusion 332 can be a non-conductive material. However,considering the necessary performance of the antenna, the handlingprotrusion 332 may also be a conductive material. As illustrated in FIG.5 and explained in greater detail below, the handling protrusion 332 isexposed through an exterior frame 400 of the terminal. Herein, theexterior frame 400 of the terminal 200 includes a third sub-slot 401,providing a path. The handling protrusion 332 is moveable along the pathprovided by the third sub-slot 401.

Furthermore, as best illustrated in FIGS. 3B and 4B, the sub-plate 331covers or surrounds the plate 321 near the guide protrusion 333. Thatis, the sub-plate 331 has a prominent part and a depressive part forsubstantially following the contour of the plate 321, especially theguide slot 322, so that, as the sub-plate 331 extends laterally relativeto the plate 321, the plate 321 and the sub-plate 331 are substantiallyin the same plane. Accordingly, the vertical space required to mountboth the plate 321 and the sub-plate 331 is substantially the same asthe vertical space required to mount the plate 321 by itself.Furthermore, as the radiator 330 is moved along the guide slot 322, theprominent and depressive parts will provide additional support andstability for the sub-plate 331 and provide a better electrical couplingto the radiator 320.

The radiator 320 includes a first radiation part 321A for processingsignals of a first frequency band and a second radiation part 321B,spaced apart from and electrically connected to the first radiation part321A, for processing signals of a second frequency band lower than thefirst frequency band. The first radiation part 321A and the secondradiation part 321B comprise the plate 321. That is, the first radiationpart 321A and the second radiation part 321B are one body, and they canseparately process signals of multiple frequency bands.

In the illustrated example, the second radiation part 321B includes theguide slot 322 which allows the sub-radiator 330 to slideably move. Inaddition, the second radiation part 321B includes the feed part 324 andthe ground part 325, each protruding from one end of the secondradiation part 321B. By mounting the antenna 300 on a PCB or motherboard of a portable wireless terminal, the feed part 324 and the groundpart 325 are electrically connected to the PCB of the portable wirelessterminal. Here, the feed part 324 provides the first radiation part 321Aand the second radiation part 321B with an electrical signal, forexample an electrical current. Therefore, the first radiation part 321Aand the second radiation part 321B radiate individually.

For example, the first radiation part 321A processes signals of a higherfrequency band, and the second radiation part 321B processes signals ofa lower frequency band. Herein, the first radiation part 321A and thesecond radiation part 321B comprise the plate 321, having a radiationpattern. The radiation pattern has a length and a width for radiatingvarious frequencies individually. For example, the radiation patternlength of the first radiation part 321A is distinguishably longer thanthe radiation pattern length of the second radiation part 321B.Accordingly, signals of a higher frequency band are processed by thefirst radiation part 321A while signals of a lower frequency band areprocessed by the second radiation part 321B.

Moreover, because the sub-radiator 330 is electrically connected to thesecond radiation part 321B and is movable, the antenna 300 can processsignals of an additional frequency band, beyond the higher frequencybands processed by the second radiation part 321B without thesub-radiator 330.

The conventional antenna 100 processes signals of dual-frequency bands,such as GSM and DCS. However, by including a sub-radiator 330, anantenna according to an exemplary embodiment of the present inventioncan individually process signals of triple frequency bands, such as GSM,DCS and PCS, or more without increasing a size of the conventionalantenna.

For example, as the sub-radiator 330 is connected electrically to thesecond radiation part 321B and is selectively movable, the antenna 300is able to process signals of a high frequency band, such as DCS andPCS, individually and selectively. As illustrated in FIG. 4A, thesub-radiator 330 can move along an imaginary line at the selection of auser, thus allowing the portable terminal to process higher frequencysignals that those processed by the second radiation part 321B alone.

FIG. 5 is a partial view of a portable wireless terminal according to anexemplary embodiment of the present invention.

Referring to FIG. 5, an exterior frame 400 includes a third sub-slot 401through which the position of the sub-radiator 330 may be controlled bya user. In an exemplary implementation, the third sub-slot 401 isprovided as an elongated hole through the exterior frame 400. Morespecifically, as described above, the multi-band built-in antenna 300 isinstalled in the terminal and the handling protrusion 332 of thesub-radiator 330 is exposed through the third sub-slot 401. The exposedhandling protrusion 332, by means of its connection to the guideprotrusion 333 movable along the guide slot 322, allows movement of thesub-radiator 330. Accordingly, by movement of the sub-radiator 330 usingthe handling protrusion 332, a user may select which frequencies are tobe targeted for reception. In addition, the handling protrusion 332 mayinclude a suitable prominence to allow easier movement by the user.Furthermore, a surface of the exterior frame 400 may include symbols,figures, lettering or other indicia for indicating a specific frequencyband, such as DCS and PCS, targeted for reception.

FIG. 6 is a graph illustrating a Voltage Standing Wave Ratio (VSWR) ofthe conventional dual-band built-in antenna illustrated in FIG. 1. FIG.7 includes a graph illustrating a VSWR and a partial plane view of themulti-band built-in antenna according to an exemplary embodiment of thepresent invention, when a sub-radiator is in a position to processsignals of a Digital Cellular System (DCS) frequency. FIG. 8 includes agraph illustrating a VSWR and a partial plane view of the multi-bandbuilt-in antenna according to an exemplary embodiment of the presentinvention, when the sub-radiator has moved to process signals of aPersonal Communication Systems (PCS) frequency.

Referring to FIGS. 6 to 8, a comparison will be made between theconventional art and exemplary embodiments of the present invention. Asillustrated in FIG. 6, the conventional dual-band built-in antenna 100processes signals of a low frequency band (between points 1 and 2; e.g.GSM) and signals of a high frequency band (between points 3 and 4; e.g.DCS). Namely, the conductive plate 121 is specifically patterned toprocess signals of the GSM and DCS bands. Therefore, because a VoltageStanding Wave Ratio (VSWR) of PCS (points 5 and 6) is from 3 to 7 andover 8, performance of the conventional dual-band built-in antenna 100is deteriorated for PCS.

Referring to FIG. 7, the sub-radiator 330 of the multi-band built-inantenna 300 is moved to process signals of a DCS band. As illustrated inFIG. 7, a VSWR of a low frequency band (points 1 and 2; e.g. GSM)indicates that the reception is substantially the same as in theconventional art. However, a VSWR of a high frequency band (points 3 and4; e.g. DCS) is lower than that of the conventional antenna 100.Therefore, it is evident that performance of the antenna 300 is improvedin the DCS band, but performance of the antenna 300 in the PCS band(points 5 and 6) is not improved.

Referring to FIG. 8, the sub-radiator 330 of the multi-band built-inantenna 300 is moved to process signals of a PCS band. As illustrated inthe VSWR graph of FIG. 8, performance of the antenna 300 in the GSM band(points 1 and 2) and the DCS band (points 3 and 4) indicates that thereception is substantially the same as in the conventional art regardingthese two bands. However, it is evident that performance of the antenna300 is improved in the PCS band (points 5 and 6).

In conclusion, performance of the antenna 300 in the low frequency band(GSM) is independent of the added radiator 330′ movement. However, tobetter process signals of high frequency bands (DCS band or PCS band)for the antenna 300, as the sub-radiator 330 is movable, performance ofthe antenna in a DCS band or a PCS band can improve markedly.

While the invention has been shown and described with reference tocertain exemplary embodiments thereof, it will be understood by thoseskilled in the art that various changes in form and details may be madetherein without departing from the spirit and scope of the invention asdefined by the appended claims and their equivalents.

1. A multi-band built-in antenna for a portable wireless terminal,comprising: a first radiation part for processing signals of a firstfrequency band; a second radiation part spaced apart from the firstradiation part and electrically connected to the first radiation part,the second radiation part for processing signals of a second frequencyband lower than the first frequency band; and a sub-radiatorelectrically connected to the second radiation part, wherein thesub-radiator is movable.
 2. The antenna of claim 1, wherein the firstradiation part processes signals of a plurality of frequency bands. 3.The antenna of claim 2, wherein the frequency band of signals processedby the first radiation part is changed by moving the sub-radiator to afirst position.
 4. The antenna of claim 1, further comprising a carrier,wherein the first radiation part and the second radiation part compriseone conductive plate, the single conductive plate being affixed to thecarrier.
 5. The antenna of claim 1, wherein the sub-radiator comprises aconductive plate.
 6. The antenna of claim 4, further comprising a guideprotrusion for moving the sub-radiator, wherein the guide protrusionprojects downwardly from a lower part of the sub-radiator towards a partof the carrier, and further wherein the second radiation part includes aguide slot for moving the guide protrusion along a path.
 7. The antennaof claim 6, wherein the carrier includes a first sub-slot for moving theguide protrusion along the path.
 8. The antenna of claim 7, wherein theguide slot comprises an elongated hole formed through the secondradiation part and the first sub-slot comprises an elongated hole formedthrough the carrier.
 9. The antenna of claim 8, further comprising aguide block, wherein the guide block has a greater width than the guideprotrusion and is fixed to a lower side of the guide protrusion, andwherein the carrier includes a second sub-slot located below the firstsub-slot and having a greater width than the first sub-slot, for movingthe guide block along a path.
 10. The antenna of claim 9, furthercomprising a handling protrusion, wherein the handling protrusionprojects upwardly from a top of the sub-radiator to an exterior of theportable wireless terminal for moving the sub-radiator from the outside,and the exterior of the portable wireless terminal includes a third-subslot for moving the handling protrusion along a path.
 11. The antenna ofclaim 1, wherein at least one of the first radiation part and the secondradiation part include a feed part and a ground part electricallyconnected to a circuit board of the portable wireless terminal.
 12. Theantenna of claim 2, wherein the first radiation part is adapted toprocess signals of at least one of a Digital Cellular System (DCS) and aPersonal Communication System (PCS), and the second radiation part isadapted to process signals of a Global System for Mobile communication(GSM).
 13. A portable wireless terminal, comprising: a Radio Frequency(RF) circuit board having a feeding unit and a grounding unit; a carriercoupled to the RF circuit board; a first radiation part adapted toprocess signals of a first frequency band and coupled to a top surfaceof the carrier; a second radiation part horizontally spaced from thefirst radiation part, electrically connected to the first radiation partand coupled to the top surface of the carrier, the second radiation partadapted to process signals of a second frequency band lower than thefirst frequency band; a feed part protruding from an end of the firstradiation part or the second radiation part and electrically connectedto the feeding unit; a ground part protruding from another end of thefirst radiation part or the second radiation part and electricallyconnected to the grounding unit; and a sub-radiator electricallyconnected to the second radiation part, wherein the sub-radiator ismovable.
 14. The portable wireless terminal of claim 13, wherein thefirst radiation part processes signals of a plurality of frequencyspectrums.
 15. The portable wireless terminal of claim 13, wherein asthe sub-radiator moves, a frequency spectrum in which the firstradiation part processes signals is diversified.
 16. The portablewireless terminal of claim 13, wherein the first radiation part and thesecond radiation part comprise one conductive plate.
 17. The portablewireless terminal of claim 13, wherein the sub-radiator comprises aconductive plate.
 18. The portable wireless terminal of claim 13,further comprising a guide protrusion projecting downwardly from a lowersurface of the sub-radiator towards the carrier, wherein the secondradiation part includes a guide slot for moving the guide protrusionalong a path.
 19. The portable wireless terminal of claim 18, whereinthe carrier includes a first sub-slot for moving the guide protrusionalong the path.
 20. The portable wireless terminal of claim 19, whereinthe guide slot comprises an elongated hole formed through the secondradiation part and the first sub-slot comprises an elongated hole formedthrough the carrier.
 21. The portable wireless terminal of claim 20,further comprising a guide block, wherein the guide block has a greaterwidth than the guide protrusion and is fixed to a lower side of theguide protrusion, and a wherein the carrier includes a second sub-slotlocated below the first sub-slot and having a greater width than thefirst sub-slot, for moving the guide block along a path.
 22. Theportable wireless terminal of claim 21, further comprising a handlingprotrusion, wherein the handling protrusion projects upwardly from a topof the sub-radiator to an exterior of the portable wireless terminal formoving the sub-radiator from outside, and the exterior of the portablewireless terminal includes a third-sub slot for moving the handlingprotrusion along a path.
 23. The portable wireless terminal of claim 14,wherein the first radiation part processes signals of at least one of aDigital Cellular System (DCS) and a Personal Communication System (PCS),and the second radiation part processes signals of a Global System forMobile communication (GSM).